Figure 4-58.Cast-iron boiler castings.
Figure 4-59.Cutaway view of a cast-iron boiler.
STEEL HOT-WATER BOILERS
Most steel hot-water boilers are constructed in two
sections. One section consists of the water jackets,
combustion chamber, and smoke passages. These
components are either welded or riveted together as a
unit. The other section consists of the base and either
the grates or burner and is constructed according to the
type of fuel used (fig. 4-60).
by water lanes. It rests either on a cast-iron or a brick
base. The front part of the boiler rests on a pedestal. A
disadvantage of this one-piece steel boiler is that it is
heavy and requires special equipment to lift it.
Another steel boiler is a horizontal unit of the
portable type, having an internal firebox surrounded
INSTALLING BOILERS FOR
A boiler must have a good foundation. The top
surface of the foundation should be level to ensure